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MathGroup Archive 2005

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Re: hunting down problems with my code

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54948] Re: [mg54895] hunting down problems with my code
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Tue, 8 Mar 2005 05:03:34 -0500 (EST)
  • References: <4FDA877403669E48A2CB7F1122A7948045C50D@dassne02.da.gei>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

It was just that i expected the slot function would be treated in the
same manner as a symbol. As I found out, non-symbols and patterns
don't like each other.


On Mon, 7 Mar 2005 09:38:58 +0100, Wolf, Hartmut
<Hartmut.Wolf at t-systems.com> wrote:
> 
> >-----Original Message-----
> >From: Chris Chiasson [mailto:chris.chiasson at gmail.com]
To: mathgroup at smc.vnet.net
> >Sent: Saturday, March 05, 2005 7:35 AM
> >Subject: [mg54948] [mg54895] hunting down problems with my code
> >
> >came down to this today:
> >
> >#_?NumberQ//FullForm
> >
> >Times[PatternTest[Blank[],NumberQ],Slot[1]]
> >
> >f_?NumberQ//FullForm
> >
> >PatternTest[Pattern[f,Blank[]],NumberQ]
> >
> >It's only amusing after the fact.
> >--
> >Chris Chiasson
> >Kettering University
> >Mechanical Engineering
> >Graduate Student
> >1 810 265 3161
> >
> >
> 
> Chris,
> 
> what makes you surprised?
> 
> In[1]:= f[1]_?NumberQ // FullForm
> Out[1]//FullForm=
> Times[f[1], PatternTest[Blank[], NumberQ]]
> 
> # is just syntactical sugar for Slot[1] (a read macro, so to speak).
> 
> --
> Hartmut Wolf
> 
> 


-- 
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161


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